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Ensure we don't overflow the phys_avail array. Some firmware may provide

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more memory locations than we have space to record.

Sponsored by:	ABT Systems Ltd
This commit is contained in:
Andrew Turner 2016-02-02 17:57:15 +00:00
parent 50d9282660
commit 332b343376
1 changed files with 3 additions and 2 deletions
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5
sys/arm64/arm64/pmap.c
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@ -596,7 +596,8 @@ pmap_bootstrap(vm_offset_t l1pt, vm_paddr_t kernstart, vm_size_t kernlen)
* up to the physical address KERNBASE points at. * up to the physical address KERNBASE points at.
*/ */
map_slot = avail_slot = 0; map_slot = avail_slot = 0;
for (; map_slot < (physmap_idx * 2); map_slot += 2) { for (; map_slot < (physmap_idx * 2) &&
avail_slot < (PHYS_AVAIL_SIZE - 2); map_slot += 2) {
if (physmap[map_slot] == physmap[map_slot + 1]) if (physmap[map_slot] == physmap[map_slot + 1])
continue; continue;
@ -612,7 +613,7 @@ pmap_bootstrap(vm_offset_t l1pt, vm_paddr_t kernstart, vm_size_t kernlen)
} }
/* Add the memory before the kernel */ /* Add the memory before the kernel */
if (physmap[avail_slot] < pa) { if (physmap[avail_slot] < pa && avail_slot < (PHYS_AVAIL_SIZE - 2)) {
phys_avail[avail_slot] = physmap[map_slot]; phys_avail[avail_slot] = physmap[map_slot];
phys_avail[avail_slot + 1] = pa; phys_avail[avail_slot + 1] = pa;
physmem += (phys_avail[avail_slot + 1] - physmem += (phys_avail[avail_slot + 1] -